I am just wondering, is this a good layout for my hybrid TEC/Watercooling setup? The Radiator is there to bring the coolant down to ambient, and the TEC is there to take it even lower.
Specs-
Swiftech Apogee Drive II (no pump)
XSPC Acrylic Dual 5.25” Reservoir with 655
Custom TEC cooler-Works as a water chiller, 4 60w TEC plates
3/8 and 1/2 tubing.

Just swap them all out for 1/2 barbs or compression fittings either 5/8 or 3/4" OD and get same size tubing all around. Keep it streamlined man. dont make it harder then it should be. Like i said. Id switch it around Go Res/Pump > Radiator > Block > TEC > ResPump Because either way the water is going to be cool when it gets to the block. And i like to have a rule of thumb to get to a radiator before hitting the blocks.

The TEC comes with 3/8 barbs. And the Rad comes with 1/2 barbs. Will it make any difference?

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Different diameters introduce changes to the water pressure, and thus contribute to flow disturbances, something you'd want to avoid. Is there a way to further integrate things, and make the TEC chiller a part of a reservoir/pump assembly, with minimal or no tubing?

the TEC will putout more heat and use more power then your CPU AND gpu Combined
a better and cooler Option would be to get the compressor off a old fridge or AC unit and adapt that
TEC is terribly inefficient

Ah, I see. Well, 240W of TEC cooling goodness is fine in a pass-through implementation, I suppose. How low do you think it'll be able to bring the water temperature? Assuming you have a very good Peltier setup, you're looking at some 10% efficiency. So, 24W of cooling power. Now if the coolant takes one second to pass through the chiller per cm³, and if we take that it has the heat capacity of water @ 25°C (4.18 W*s/cm³*°C) you'd only be looking at a ~5°C reduction at best. Is 240W of power really worth it? I do realize there's an advantage to not going far below ambient - no condensation.

On a side note, I've been thinking of branching out a pair of tubes off of an AC unit, and connecting them to a cooling block. That'd be interesting.

Just swap them all out for 1/2 barbs or compression fittings either 5/8 or 3/4" OD and get same size tubing all around. Keep it streamlined man. dont make it harder then it should be. Like i said. Id switch it around Go Res/Pump > Radiator > Block > TEC > ResPump Because either way the water is going to be cool when it gets to the block. And i like to have a rule of thumb to get to a radiator before hitting the blocks.

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Agreed. I always get the water going through the radiator before going through the blocks.

Ah, sorry about that, only a few reservoirs have an after market pump top on them that increase the pump performance, like the Maelstrom. Most have no affect, or can even reduce performance if your pump already has a top but the res doesn't.